Essays about: "snails"

Showing result 16 - 20 of 23 essays containing the word snails.

1. 16. The estrogen receptor in the freshwater pulmonate gastropod Radix balthica: Investigating changing activity levels from exposure to 17α -ethinylestradiol

   University essay from Lunds universitet/Miljövetenskaplig utbildning

   Author : Lina Börjesson; [2012]
   Keywords : Earth and Environmental Sciences;

   Abstract : Endocrine disruption from synthetic human estrogens in molluscs has not been investigated as closely as in vertebrates. This has led to a missing piece in the important puzzle investigating the differences in effects between diverse animal groups after exposure to endocrine disrupting chemicals, EDCs. READ MORE

3. 17. Predator-induced morphological defences in a freshwater snail

   University essay from Institutionen för ekologi, miljö och geovetenskap

   Author : Annelie Lagesson; [2011]
   Keywords : ;

   Abstract : The ability of a certain genotype to express different phenotypes depending on variations in the environment is called phenotypic plasticity. Predator induced defences are among the most studied and wide spread examples of phenotypic plasticity. READ MORE

4. 18. Restoration of a Rich Fen by Top Soil Removal : Temporal and Spatial Responses among Vascular Plants, Bryophytes and Land Snails during 15 years

   University essay from Institutionen för biologisk grundutbildning

   Author : Liselott Evasdotter; [2011]
   Keywords : rich fen; restoration; top soil removal; succession; land snails;

   Abstract : Rich fens are calcareous and nutrient poor wetlands with a rich flora of orchids, sedges and mosses. As many as one hundred plant species are rich fen specialists. Many wetlands have been drained historically, and transformed to agricultural land or production forests. Today rich fens cover only 2-3% of the total mire area in Sweden. READ MORE

5. 19. Biodiversity in constructed wetlands in Southern Sweden - Evaluation of new wetlands within the Tullstorp Stream Restoration Project

   University essay from Lunds universitet/Miljövetenskaplig utbildning

   Author : Agnieszka Duma; [2011]
   Keywords : Earth and Environmental Sciences;

   Abstract : Scania is a region in southern Sweden that used to be a region of wetlands. Nevertheless, due to human activities wetland loss is an established matter currently, and following from that, changes in biodiversity, water regime and nutrient retention. One purpose of creating new wetlands is to reinstate good status of biodiversity. READ MORE

6. 20. Factors conditioning the distribution of fresh water pulmonates, Biomphalaria spp., Bulinus spp., and Lymnea spp., in Babati District, Tanzania.

   University essay from Institutionen för livsvetenskaper

   Author : Anna Lydig; [2009]
   Keywords : snail distribution; Pulmonata; chemical factors; biological factors; Babati; Tanzania;

   Abstract : The aim of this essay was to investigate if different variables affected the distribution of fresh water pulmonate in Babati District, Tanzania. Can the absence of intermediate host be explained by basic vegetation evaluation, pH, conductivity and temperature? Or can it be explained by other factors as animals and vegetation in the surrounding? The study was carried out in Babati District, in Lake Babati, Kiongozi/Farahani River and the irrigation schemes in Matufa and Gichameda from the 23td of February until 7th of March, 2009. READ MORE